watchdog: msc313e: Fix clock leak and spurious timer in settimeout()

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Summary

CVECVE-2026-97969
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:24 UTC
Updated2026-09-25 11:17:24 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: watchdog: msc313e: Fix clock leak and spurious timer in settimeout() msc313e_wdt_settimeout() unconditionally calls msc313e_wdt_start() which introduces two severe bugs: 1. If the watchdog is already active, calling start() again will increase the reference count of the clock again. However stop() is only called once, the reference count is unbalance. 2. If the watchdog is stopped, calling settimeout() will start the hardware timer accidentally. Factor out the register-writing logic into a helper function. Only call it in settimeout() if the watchdog is running. Otherwise, simply update `wdev->timeout`.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.054010000 (date 2026-09-27)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e9800b7994642a794afd4894f072541c14277ce8 2152a13ee2a9af09a668ebd053a8dbf771dadb80 git Not specified
CNA Linux Linux affected e9800b7994642a794afd4894f072541c14277ce8 2abf99a57b0b71b2b97745981f4039370ab78044 git Not specified
CNA Linux Linux affected e9800b7994642a794afd4894f072541c14277ce8 faf1eb2895c87a8c0fb920439dddc7e0d97c6a69 git Not specified
CNA Linux Linux affected e9800b7994642a794afd4894f072541c14277ce8 3db30f315935c2fb0d95f46b7a593b5b4d3ec3d0 git Not specified
CNA Linux Linux affected 5.14 Not specified
CNA Linux Linux unaffected 5.14 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2abf99a57b0b71b2b97745981f4039370ab78044 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3db30f315935c2fb0d95f46b7a593b5b4d3ec3d0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2152a13ee2a9af09a668ebd053a8dbf771dadb80 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/faf1eb2895c87a8c0fb920439dddc7e0d97c6a69 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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